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Number Processing and Heterogeneity of Developmental Dyscalculia: Subtypes with Different Cognitive Profiles and Deficits
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Skagerlund, Kenny; Träff, Ulf – Journal of Learning Disabilities, 2016
This study investigated if developmental dyscalculia (DD) in children with different profiles of mathematical deficits has the same or different cognitive origins. The defective approximate number system hypothesis and the access deficit hypothesis were tested using two different groups of children with DD (11-13 years old): a group with…
Descriptors: Learning Disabilities, Cognitive Ability, Number Concepts, Mathematics Skills
Attention Deficit Disorder with and without Hyperactivity: Reaction Time and Speed of Cognitive Processing.
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Hynd, George W.; And Others – Journal of Learning Disabilities, 1989
A study compared the reaction time and efficiency of cognitive processing on a speeded classification task, involving 43 children with attention deficit disorder/hyperactivity, 22 children with attention deficit disorder without hyperactivity, and 16 controls, aged 6-13. It was found that the children's diagnoses could not be distinguished on…
Descriptors: Attention Deficit Disorders, Cognitive Processes, Comparative Analysis, Hyperactivity
Naming Speed in Children with Dyslexia.
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Fawcett, Angela J.; Nicolson, Roderick I. – Journal of Learning Disabilities, 1994
Naming speed skills of 45 dyslexic children (mean ages=8, 13, and 17) and slow learning children (mean age=10) were compared with those of normally achieving children. Results indicated that children with dyslexia and slow learners have persistent and severe problems in naming speed for all stimuli, regardless of whether the stimulus requires…
Descriptors: Cognitive Processes, Decoding (Reading), Dyslexia, Expressive Language
Persistence of Phonological Processing Deficits in College Students with Dyslexia Who Have Age-Appropriate Reading Skills.
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Wilson, Alexander M.; Lesaux, Nonie K. – Journal of Learning Disabilities, 2001
A study investigated phonological processing skills of 28 undergraduates with dyslexia. When compared to 31 controls, subjects performed significantly less well on standardized measures of reading and spelling but in the average range. Controls, however, performed significantly better on all phonological processing measures, particularly those…
Descriptors: Adults, Cognitive Processes, College Students, Dyslexia
Speed of Information Processing in Children Referred for Learning Problems: Performance on a Visual Filtering Test.
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Weiler, Michael D.; Harris, Naomi S.; Marcus, David J.; Bellinger, David; Kosslyn, Stephen M.; Waber, Deborah P. – Journal of Learning Disabilities, 2000
Children referred for evaluation of learning impairment (n=100) and 243 typical children were evaluated on a visual filtering task. With each additional processing demand, response times increased disproportionately for children with learning impairments. Overall response time predicted academic skills and cognitive ability, but was more strongly…
Descriptors: Academic Ability, Cognitive Processes, Elementary Education, Learning Disabilities
Lexical Access in College Students with Learning Disabilities: An Electrophysiological and Performance-Based Investigation.
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Rubin, Scott S.; Johnson, Clinton M. – Journal of Learning Disabilities, 2002
A study of the semantic processing abilities of undergraduates with learning disabilities (LD) (n=11) and controls (n=11) found no significant differences on the Test of Adolescent/Adult Word Finding; however, students with learning disabilities demonstrated a significantly greater number of delayed responses. Students with LD also showed delays…
Descriptors: Cognitive Processes, Higher Education, Learning Disabilities, Neurological Impairments